Printing press



KELLY PRINTNG PRESS Oct. l5, 1940.

Filed July 13, 1959 4 Sheets-Sheet 1 W. M. KELLY PRINTING PRESS' oct. 115, 1940.

Filed July 15).' 193g 4 Sheets-Sheet 2 W. M. KELLY BRINIING PRESS Oct. 15, 1940.

Filed July 15, 1959 4 Sheets-:Sheet 15 oct. 15, 1941 w. M. KELLY 2,218,151

' PRINTING PRESS Filed July 13, 1939 4 Sheets-Sheet 4 Wiz/1m Mfg/zg Patented Oct. 15, 1940 UNITED STATES PTENT CFFICEv 9 Claims.

This invention relates to printing presses. More particularly it has to do with the tworevolution type of press in which there is a reciprocating bed and acontinuously rotating impression cylinder which makes two revolutions for each reciprocation of the bed, the cylinder being lowered for the printing stroke of the bed and 'raised during the return stroke.

Accordingly, an object of the present invention is to provide a driving mechanism for the bed which will impart to it a uniform movement during the impression stroke and a harmonic movement on the reverse and return stroke.

Another object of the present invention is to provide means to rotate the impression cylinder in time with the reciprocations of the bed.

Another object oi the present invention is to provide a means for connecting the impression cylinder to the driving gear whereby the gear is maintained concentrically mounted irrespective of the lowering and raising movements of the cylinder with respect to the bed.

A further object of the present invention is to provide a means for automatically lowering the impression cylinder toward the bed for the printing stroke and for raising the impression cylinder from the bed for the return or idle stroke. Other objects and advantages will be apparent as the invention is described in greater detail in connection with the accompanying drawings wherein:

Figure 1 is a side elevational view of a printing press having the structure of the present invention embodied therein.

Figure 2 is a transverse sectional view through the impression cylinder and bed operating mechanism.

Figure 3 is a sectional view in plan taken on the line 3 3 of Figure 1.

Figure 4 is an enlarged sectional elevational view, showing the means for connecting the driving gear to the impression cylinder and the mechanism for eiecting movement of the cylinder toward and from the bed.

Figure 5 is a vertical elevational view taken on the line 5 5 of Figure 4 with parts omitted for the sake of clarity.

Referring to the drawings the numeral IU designates the frame of the printing press which supports the main driving shaft II, this shaft having mounted on its outer end a pulley I2. The pulley I2 is driven by the motor pulley I3, Figure l, through the medium of a belt I4.

As shown in Figures 1 and 2, the inner end of the main driving shaft I I carries a gear I5 which meshes with a larger gear I6 on a countershaft Il, the countershaft being jo-urnaled in bearings in the frame IIJ and carrying a pinion gear I3 outside the frame which meshes with a larger gear I9 arranged outside the frame on a. driving shaft 20. The gear I9 meshes with an idler gear 2I arranged on a stud. 22. The usual impression cylinder 23, which may be of any preferred construction, is arranged on a shaft 24 above the bed 25 and is driven by means of gear 26 meshes with the gear 2 I. It is to be noted that the gear train is so selected that the cylinder gear 26 will make two complete revolutions to one of shaft 2G.

Attached to the sides of the bed 25, Figures 1 15 tion of Figure 2 it will be seen that shaft 3| also 20 carries bed-supporting rolls 32 and 33 suitably spaced from each other and disposed centrally thereon. Arranged at a point adjacent the outer ends of the bed 25 and supported by the top of the frame I0 are tracks 34 and -35 which extend 25 longitudinally of the bed, said tracks supporting anti-friction rollers 36 and 3l, preferably of the slider type.

Referring to Figure 2, it will be seen that the impression cylinder 23 is provided with bearers 30 d8 and 139 at the ends thereof which ride upon bed bearers 5i) and 5I carried by the tops of racks 27 and 28.

Mounted on the shaft 3I, Figures 1, 2, and 3,

intermediate the bed-drive gears 29 and 30 is a 35 pinion 38 which is in mesh with a segment gear 39 fulcrumed as at 40. 'I'he segment gear 39 carries a link Iii which is connected to a block 42 slidab-ly mounted upon a slotted crank arm 43 secured to the inner endof the driving shaft 20 by means of a Wrist pin 44. The inner end of the pin IM carries a roller 45 rotatably mounted thereon which engages the cam slo-t 4S of a synchronizing face cam il Xedly secured to the inner portion of the frame I0. It is to be noted that the mounting of the gear segment 39 is such that its course of travel is in reverse direction to that of the reciprocations of the bed 25. Such mounting has the advantage of balancing mornentunlI thrust.

As will be observed from Figure 1 approximately one-half of the cam slot 46 isr concentric with the `axis of the shaft 29 and the other half isi of varying curvature and the different portions thereof are arranged at differentdistances from which lo the axis of the shaft 20 so that as the slotted arm 43 rotates, the wrist pin 44 will be at a uniform distance from the shaft 201 while traversing the lower half of the cam slot 4S and will, as a consequence, give simple harmonic motion to the gear segment 39. While the roller 45 is traversing kthe upper part of the cam slot 4S the distance of the wrist pin 44 from the axis of the shaft 2i! will vary and consequently the velocity imparted to the gear segment 39 will be in accordance with this varying distance. The upper part of the cam slot 45 is so designed that the gear segment 39 will move at a uniform velocity while the roller 45 is traversing this part of theslot and therefore, the gears 29 and 36 will also travel at a uniform velocity, and these gears and the pinion 38 and gear segment 39 will cooperate to give to the bed 25 the requisite uniform motion on the forward printing stroke. While the roller 45 is traversing the lower half of the cam slo-t 46, the crank arm 43 and gear segment 39 and pinion 38 will cooperate to give to the bed 25 the harmonic motion on the reverse idle stroke.

By reference to Figures 2 and 4 it will be seen that the shaft 24 of the impression'cylinder 23 extends through a housing 52 and is journaled in the concentrically arranged bore in an eccentric 53 mounted within such housing, The eccentric 53 is provided with a sleeve 55, Figure 5, which extends outwardly from the housing 52. 1t is to he noted that the inner peripheral bore of the sleeve 55 is eccentric while the outer peripheral surface is concentric. Journaled upon the outer concentric surface of the sleeve 55 is the gear 255. Disposed directly beyond the end of the sleeve and keyed to the shaft 24 is a disk 56 provided with a radial slot 51 in which is mounted a slide block 58. A pin 5S passes through the slide block 58 and is screwed into the side of the gear 25. During the course of rotative travel of the eccentric 53, the slot 51 moves up and down` about the pin 59. Protruding from the other end of the impression cylinder 23 is a shaft S0 which extends through a housing 6I and is journmed in the concentrically arranged bore in an eccentric 62 mounted within such housing. Thisy mounting of the cylinder shafts 24 and 6D is of particular advantage in that it enables the cylinder gear 23 to be maintained concentrically mounted irrespective of the lowering and raising movements of the cylinder with respect to the bed.

The eccentric 53, Figure 2, is connected to an arm 64 secured to one end of a rock-shaft 65 by means of a link 6G. Eccentric 652 is also connected to an arm E1 secured to the opposite end of rock-shaft 65 through the medium of a link 58. The arm 61, Figure 3, carries a pin 'VI adapted to be engaged by a hook 19, Figure 5, on one end of a link 59 which is pivoted as at 'i8 to an arm 'l0 carried by a shaft 1I. As shown in Figures 3 and 5, the other end of the link 5d is provided with a weight 'i8'. Mounted on the shaft 1| and secured thereto is an arm l2, said arm carrying a roller 15, Figure 4, which engages the cam slot 'I4 of a cam 73 rotatably mounted on the driving shaft 2U. As will beseen from Figure 5, the rotation of the shaft 20 causes the arms l@ and 'l2 to be rocked back and forth and so long as the hook 19 is in engagement with the pin '51, the impression cylinder 23 through the eccentrics 53 and 62 will be uniformly raised and lowered in accordance with the reciprocations of the bed 25.

As shown in Figure 1, the printing press includes a feed pile table adapted to feed sheets singly from a pile supported thereon to a feed board 8| by which the sheet is conveyed to the impression cylinder 23. The cylinder is provided with the usual grippers but since they form no part of the present invention it is not deemed necessary to make a showing thereof. The sheet upon reaching the cylinder is taken up by the grippers, and when the portion marked P. P. on the right of Figure 1 of the type form carried by the bed 25 has been advanced until it reaches the center of the impression cylinder, the printingr begins and continues" until a maximum, for example 1'7 inches, is reached, whereupon the grippers release the printed sheet. With the release of such sheet it isv deposited upon the tapes 82 and is conveyed by such tapes to a delivery pile table 83. Upon the reverse idle stroke, the cylinder is raised by the eccentricsy 53 and 62 to clear the type form. It is to be noted that to the right of the cylinder is mounted an inking mechanism 84.

It will be apparent from the above description that the present invention offers decided advantages in compactness and simplicity and, while the invention is preferably constructed in accordance with the accompanying drawings, various changes and substitutions may be effected therein as fall within the spirit and scope of the appended claims.

Having fully described the invention, what I claim as new and desire to secure by Letters Patent is:

1. In a printing press having a reciprocating bed adapted to execute a forward printing stroke and a reverse idle stroke, the combination with a toothed rack secured to said bed, of means for driving said rack and bed in alternately opposite directions, said means including a gear meshing with said rack, a second gear secured for rotation with said first named gear, a rotatable driving element, a fulcrumed segment gear operatively connected to said element and engaging and driving said second gear, and mechanism including a fixed cam associated with said segment gear for imparting substantially harmonic reciprocation thereto.

2. A printing press according to claim 1 wherein the mechanism comprises a xed synchronizing cam, and a link carried by said gear segment having its free end operatively connected to said cam.

3. A printing press according to claim 1 wherein the mechanism comprises a fixed synchronizing cam provided with a slot, a link carried by said gear segment, and roller means carried by said link mounted for travel in said slot.

4. In a printing press having a reciprocating bed adapted to execute a forward printing stroke and a reverse idle stroke, the combination with a toothed rack secured to said bed, of means for driving said rack and bed in alternately opposite directions, said means including a gear meshing with said rack, a second gear secured for rotation with said first named gear, a rotatable driving element having a slotted arm secured thereto and carried thereby, a block slidably mounted upon said arm, a fulcrumed segment gear positioned to engage and drive said second gear, a link carried by said gear segment, a wrist pin connecting said link to said block, and means associated with said wrist pin for imparting substantially harmonic reciprocation to said gear segment.

5. In a printing press having a reciprocating bed adapted to execute a forward printing stroke and a reverse idle stroke, the combination with a toothed rack secured to said bed, of means for driving said rack and bed in alternately opposite directions, said means including a gear meshing with said rack, a second gear secured for rotation with said rst named gear, a rotatable driving element having a slotted armA secured thereto and carried thereby, a block slidably mounted upon said arm, a fulcrumed segment gear positioned to engage and drive said second gear, a link carried by said gear segment, a wrist pin connecting said link to said block, and means associated with said wrist pin for imparting substantially harmonic reciprocation to said gear segment, said last named means comprising a fixed synchronizing cam provided with a slot, and roller means carried by said Wrist pin mounted for travel in said slot.

6. In a printing press having a reciprocating bed adapted to execute a forward printing stroke and a reverse idle stroke, the combination with toothed racks disposed at each side of and secured to said bed and extending longitudinally thereof, of a shaft extending transversely of said racks, a pair of gears carried by said shaft and positioned so they are in meshing engagement i with said racks, an intermediate gear disposed between said pair of gears and carried by said shaft, a rotatable driving element embodying a second transversely disposed shaft, a fulcrumed segment gear operatively connected to said last named shaft and engaging and driving said intermediate gear, and mechanism including a xed cam associated with said segment gear for imparting substantially harmonic reciprocation thereto.

7. A printing press accordingto claim 6 wherein the mechanism comprises a fixed synchronizing cam, and a link carried by said gear segment having its free end operatively connected to said cam.

8. In a printing press having a reciprocating bed adapted to execute a forward printing stroke and a reverse idle stroke, the combination with racks disposed at each side of and secured to said bed and extending longitudinally thereof, of a shaft extending transversely of said racks, a pair of gears carried by said shaft and positioned sov bed adapted to execute a forward printing stroker and a reverse idle stroke, the combination With racks disposed at each side of and secured to said bed and extending longitudinally thereof, of a shaft extending transversely of said racks, a pair of gears carried by said shaft and positioned so that they are in meshing engagement with said racks, an intermediate gear disposed between said pair of gears and carried by said shaft, a rotatable driving shaft having a slotted arm secured thereto and carried thereby, a block slidably mounted upon said arm, a fulcrumed segment gear positioned to engage and drive said intermediate gear, a link carried by said gear segment, a wrist pin connecting said link to said block, and means associated with said pin for imparting substantially harmonic reciprocation to said gear J-.f

segment, said last named means comprising a fixed synchronizing cam provided with a slot, and roller means carried by said pin mounted for travel in said slot.

WILLIAM M. KELLY. 

